| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve the problem that a selected arithmetic processing can not be changed even in the case that it is considered that throughput is to be raised by a processing method other than the arithmetic processing selected by an evaluation function based on a fixed evaluation index in the case of carrying out a data connection arithmetic processing to a distributed data base system. SOLUTION: Plural composite data base arithmetic processings are generated by a decomposition generation part 11 from a composite data base arithmetic operation supplied from an operator, the evaluation function stored in an evaluation function set file 4 is applied for the plural composite data base arithmetic processings and evaluation information is acquired by an evaluation information acquisition part 12. The composite data base arithmetic processing of high evaluation is selected from the plural composite data base arithmetic processings by an evaluation part 13 based on the acquired evaluation information and performed by an arithmetic operation performance part 14.</p> |
